January 25, 2014

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January 25, 2014

Postby ArkieTech » Sat Jan 25, 2014 12:26 am

Code: Select all
 *-----------*
 |..2|.6.|..1|
 |..6|5..|.4.|
 |.4.|8..|2..|
 |---+---+---|
 |98.|...|4..|
 |...|425|...|
 |..1|...|.65|
 |---+---+---|
 |..9|..8|.1.|
 |.6.|..9|8..|
 |3..|.4.|6..|
 *-----------*


Play/Print this puzzle online
dan
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Re: January 25, 2014

Postby Leren » Sat Jan 25, 2014 12:39 am

Code: Select all
*--------------------------------------------------------------*
| 578   3579  2      | 37    6     4      | 3579  3578  1      |
| 178   1379  6      | 5     137   2      | 379   4     378    |
|a57-1  4     37     | 8     9     137    | 2    b357   6      |
|--------------------+--------------------+--------------------|
| 9     8     5      | 137   137   6      | 4     237   237    |
| 6     37    37     | 4     2     5      | 1     89    89     |
| 4     2     1      | 9     8     37     | 37    6     5      |
|--------------------+--------------------+--------------------|
| 2     57    9      | 6     357   8      | 357   1     4      |
|e17-5  6     4      | 1237  1357  9      | 8     2357  237    |
| 3    d157   8      | 127   4     17     | 6    c2579  279    |
*--------------------------------------------------------------*

L2 Wing: (5) r3c1 = r3c8 - r9c8 = (5-1) r9c2 = (1) r8c1 => - 1 r3c1, - 5 r8c1; stte

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Re: January 25, 2014

Postby tlanglet » Sat Jan 25, 2014 3:46 pm

Initially, I noted some single digit steps including multi-coloring on 1, coloring on 3 & 5, and the skyscraper on 5 that completed the puzzle. Looking again, I realized the combination of the skyscraper(5) and the strong link on 1 in box 7 was sufficient to complete the puzzle.

Skyscraper(5)r39c8 with pincers 5r3c1 & 5r9c2 => r1c2, r8c1<>5.

Then working with the pincers: 5r3c1=(5-1)r9c2=1r8c1 => r3c1<>1

Finally, as I prepared to post my solution, I saw that Leren had already posted it. :lol:

Ted
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Re: January 25, 2014

Postby daj95376 » Sat Jan 25, 2014 5:18 pm

Leren's L2-Wing is the only single-stepper chain that my solver located. Also, all of the simpler network solutions seem to include portions of the L2-Wing.
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Re: January 25, 2014

Postby Marty R. » Sat Jan 25, 2014 9:11 pm

Code: Select all
+-------------+---------------+---------------+
| 578 3579 2  | 37   6    4   | 3579 3578 1   |
| 178 1379 6  | 5    137  2   | 379  4    378 |
| 157 4    37 | 8    9    137 | 2    357  6   |
+-------------+---------------+---------------+
| 9   8    5  | 137  137  6   | 4    237  237 |
| 6   37   37 | 4    2    5   | 1    89   89  |
| 4   2    1  | 9    8    37  | 37   6    5   |
+-------------+---------------+---------------+
| 2   57   9  | 6    357  8   | 357  1    4   |
| 157 6    4  | 1237 1357 9   | 8    2357 237 |
| 3   157  8  | 127  4    17  | 6    2579 279 |
+-------------+---------------+---------------+

Play this puzzle online at the Daily Sudoku site

I'm wimping out with a two-stepper.

Sashimi X-Wing (1), r38=>r9c6<>1
Skyscraper (5), r39 finishes it off
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Re: January 25, 2014

Postby blue » Sat Jan 25, 2014 10:12 pm

Code: Select all
+-------------------+-------------------+---------------------+
| 578    3579    2  | 37    6     4     | 3579  357(8)  1     |
| 7(18)  1379    6  | 5     137   2     | 379   4       37(8) |
| 57(1)  4       37 | 8     9     37(1) | 2     357     6     |
+-------------------+-------------------+---------------------+
| 9      8       5  | 137   137   6     | 4     237     237   |
| 6      37      37 | 4     2     5     | 1     (89)    89    |
| 4      2       1  | 9     8     37    | 37    6       5     |
+-------------------+-------------------+---------------------+
| 2      57      9  | 6     357   8     | 357   1       4     |
| 57(1)  6       4  | 1237  1357  9     | 8     2357    237   |
| 3      7-1(5)  8  | 127   4     7(1)  | 6     27(59)  279   |
+-------------------+-------------------+---------------------+

Almost Skyscraper (found by code) ...

5r9c2 = (5-9)r9c8 = (9-8)r5c8 = r1c8 - r2c9 = (8-1)r2c1 = (Skyscraper: (1)c16\r3) => r9c2<>1; stte
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